Google talk is recently merged with the new sensation Orkut.
Enabling the integration between orkut and Google Talk opens up a host of new functionality in both products. From orkut, you'll be able to chat or make voice calls, and your friends' online status will be displayed. Google Talk accounts will have additional functions including the ability to send scraps from the Google Talk client, view your friends' profiles, and receive notification of new scraps.
To link your Google Talk and Orkut account, go to Orkut Settings tab and click enable Google Talk to chat with your orkut friends.
If any of your GTalk friends are on Orkut, a coloured circle will appear next to their profile name on Orkut showing their chat status. Click the circle to initiate a new voice or text chat session over Google Talk
To download Google Talk